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Here is the CCEMGL salvo fire gun I mentioned it is not too visually exciting lol, but I cited this one because the mass is vaguely in a possible range to imagine fitting it onto a spacecraft, it is approx 2.25 m length 30mm bore with 273kg mass, fires 5 rounds each of 185g projectiles at a velocity of 1400m/s (for comparison, a .50 BMG round is about 50g at a velocity of 900 m/s)